Data on a variety of social and economic characteristics for persons and families of Mexican, Puerto Rican, and other Spanish origins and comparative data for the total white and Negro population are presented in this report. Tables contain information concerning population size, income, employment, education, and the family. It was determined that about 9 million persons identified themselves as being of Spanish origin in March 1971, including 5 million who were of Mexican origin and about 1 1/2 million who identified themselves as of Puerto Rican origin. The median family income in 1970 for all families of Spanish origin was lower than the median income for all white families but higher than that for black families. Unemployment rates were higher for persons of Spanish origin than the national average and about the same as the rate for men of Negro and other races. Among persons 25 to 29 years old, 48% of persons of Spanish origin had graduated from high school compared to 58% of Negroes and 80% of all whites. One-third of the Negro and Puerto Rican families had a female head. (HBC)